<template>
  <div class="app">
    <h3>我是APP组件</h3>
    <Suspense>
      <template v-slot:default>
        <Child></Child>
      </template>
      <template v-slot:fallback>
        <h3>稍等加载中...</h3>
      </template>
    </Suspense>
  </div>
</template>

<script>
// import Child from './components/Child'// 静态引入
import { defineAsyncComponent } from "vue";
const Child = defineAsyncComponent(() => import('./components/Child.vue')) // 动态引入
export default {
  name: 'App',
  components: {
    Child
  },
};
</script>

<style scoped>
  .app {
    background-color:  gray;
    padding: 10px;
  }
</style>